Being an opera ignoramus, I consulted Prof. Wiki who told me: The opera includes the popular Flower Duet (Sous le dôme épais) for sopranos performed in Act 1 by Lakmé, the daughter of a Brahmin priest, and her servant Mallika.

The Reason:

What a resonant phrase: “Someone I was in love with once.” I was torn as to whether to try delving deeper or leave it enigmatic and retain its poetry. Decided on the latter. That’s probably why I don’t work for the Daily Mail (and why it doesn’t work for me – world without poetry).

Here’s what it sounds like:

Sadly I know it only from some advert – was it for a bank? or a train?